function Circle() {
    createjs.Shape.call(this);
    this.setColor = function(colorString) {
        this.graphics.beginFill(colorString);
        this.graphics.drawCircle(0, 0, 5);
        this.graphics.endFill();
    }

    this.setCircleType = function(type) {
        this._circleType = type;
        switch (type) {
            case 1 :
                this.setColor('#cccccc');
                break;
            case 2 :
                this.setColor('green');
                break;
            case 3:
                this.setColor('purple');
                break;
        }

    }
    this.setCircleType(1);
}

Circle.prototype = new createjs.Shape();